schumann



(No Model.) 2 Sheets-Sheet 1.

I F. SGHUMANN.

STEAM VALVE.

N0. 3 814. Q N Patented Apr. 13, 1886.

@zlf a R Fhulo-Lilhognphar. Washington D4 (2 (No Model.) 2 Sheets-Sheet 2. P. SOHUMANN.

STEAM VALVE- Patented Apr. 13, 1886 N. PETERS, Phewuum n ne UNITED STATES- PATENT FFICE.

FRANCIS SCHUMANN, OF TRENTON, NEW JERSEY, ASSIGNOR OF ONE-HALF TO W. D. HAVEN, OF SAME PLACE.

STEAM-VALVE.

SPECIFICATION forming part Of Letters Patent N0. 339,814, dated April 13, 1836.

Application filed October 29, 1885. Serial No. 181,295. (No model.)

To all whom it may concern:

Be it known that I, FRANCIS SCHUMANN, a citizen of the United States, residing at Trenton, in the county of Mercer and State of New Jersey, have invented certain new and useful Improvements in Steam-Valves; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates, first, to certain improvements in the construction and relative arrangement of a rotating and reciprocating steam-valve and the surrounding casing or steamchest.

By the means which I have devised I am able to use a single valve and a single rotating device for both ends of the cylinder and at the same time to effect the cutting off of the steam entirely by the rotation of the valve. This results in simplicity of mechanism and a certain and easily-regulated cut-off which is unatfected by the longitudinal position or reciprocation of the valve.

My invention relates, secondly, to an improved means for rotating and reciprocating a valve to which such motions are necessary. It is desirable that the cut-off by the rotation of the valve should not be so gradual as to produce what is termed wire-drawing the steam, but that the port should be kept well open till the time for cutting off approaches, and that then the rotation of the valve should be so accelerated as to effect the cut-oft with some degree of suddenness.

My invention can best be understood by reference to the accompanying drawings, in which I have shown means for carrying it'into effect.

In said drawings, Figure 1 is a side elevation, partly broken away, of a steam-cylinder, steam-chest, valve, and operating mechanism embodying my invention. Fig. 2 is a crosssection of the valve and steam-chest or valvecasing on the line 2 2. Fig. 3 is an end elevation of a part of the valve-operating mechanism upon a larger scale.

A indicates the steam-cylinder, and B the valve-casing or steam-chest. The latter is cylindrical, receives the live steam through an opening, I), communicates with the cylinder at or near each end through ports a a, and communicates with the exhaust-ducts O C, also at each end of the cylinder. A single cylindrical valve fits in the case B, in which it is reciprocated and oscillated by a valvestem, D, and opens and closes both the steam and the exhaust ports at each end of the cylinder. The valve is arranged to regulate the admission of the live steam into the cylinder, and particularly to perform the cutting off of the steam-supply from the cylinder entirely by its movement of rotation and independently of its reciprocation. The reciprocation of the valve effects the opening and closing of the exhaust-ports.

If the live steam in passing through the valve and into the cylinder took such course as to be materially affected in quantity by the reciprocation of the valve, a regulation of the rotation alone of the valve would not with certainty regulate the speed of the engine; but under the arrangement shown this latter result is attained by connecting a speed-regulator with those devices alone which cause the 7 5 rotation of the valve, since the cut-off is governed by the rotation alone. This latter end is effected by admitting the live steam freely and constantly to the interior of the valve, and thence passing it periodically directly to the interior of the cylinder by the registering of the valve-ports, through the rotation or 0scillation of the valve,with the cylinder-ports.

That portion of the valve which etl'ects the covering and closing of the cylinder-ports is indicated at D D, consisting in the construction shown of two hollow cylinders secured to the valve-stem through the medium of webs d and hubs d. These cylinders are provided with ports d (1 adapted to register with the 0 ports a a, as above described. The ports d at one end of the valve are situated relative to the ports d at the other end in a well-known mannerthat is to say, so that when the valve and cylinder-ports at one end register those 5 at the other end of the cylinder will not.

The cylinder-ports are several in number, by preference,(see Fig.2,) and steampassages a" lead from them to the cylinder.

The exhaust-ports are opened and closed in a well known manner by the ends of the valve.

I will now proceed to describe the means which I have devised for giving to the above valve the necessary motions.

E is a lever-adapted to rock upon a fixed pivot, e. The lower arm of the lever is connected with the valve-stem D by a link, F, pivoted to the lever-arm at f, and having a ball-and-socketjoint with the "alve-stem at f. The upper arm of the lever E is oscillated by the positive eccentric,(not shown,)which thus opens and closes the exhaust-ports.

My principal improvements in the devices by which the oscillation of the valve is effected consist in certain universal-joint connections by which such oscillation is caused with much ease and accuracy, and also inan arrangement by which the oscillation of the lever E, which reciprocates the valve,is utilized to give a very desirable acceleration to its rotary cutoii" action. The particular arrangement shown for causing this cooperation of the reciprocating with the rotating mechanism consists of a bell-crank lever, G, pivoted at g upon the lower arm of the lever E, an eccentric-rod, H, an eccentric,(not shown,) and a device for converting the oscillation of the bell-crank lever into an oscillation of the valve-stem in a plane at right angles to that of the former oscillation. Themost convenient means for such conversion is a rod,J, connected by a ball-andsocketjoint, 7',with the arm 9 of bell-lever G, and by a balhandsocket joint,j,with a crankarm,D,on the valve-stem. A raclrand-pinion movement or equivalent device might, how ever, be substituted.

The operation of this last-described mechanism is as follows: Supposing the positive eccentric-rod and the upper end of the lever E to be moving in the direction of the arrow 1, and the lower end of said lever and the valvestem to be moving in that of arrow 2. Under such conditions the other eccentric (by its arrangement on the engine-shaft) and the lower end, g", of the bell-lever will be moving in the direction of the arrow 3, and the other arm, 9, the rod J, and the crank-arm I) in the direc tion of arrows 4, to effect the cutoff of steaun It will now be evident that since the pivot g is being carried to the right by the lever E, while the lower-arm-of lever G is carried to the left by its eccentric, there will be an upward movement of the arm 9 and a rotation of the valvestem D in acceleration of or be- I yond the effect of the eccentric which operates This gives a full steam-opening for a longertime and a more sudden cut-ofi'.

The regulator of the engine is applied to the eccentric, which operates rod H. This may be of the character shown by my Patent No. 318,663, dated May 26,1885.

It may be observed that if the lever G be pivoted to the lever E at such distance from the pivot of the latter as to receive sufficie'nt bodily motion it would suffice to oscillatethe valve if the rod H were connected to a fixed point. In such case the regulation might be effected by connecting the rod H, instead of with a fixed point, with an ordinary ball-governor.

The rod J is arranged and constructed to be adjusted in length to properly regulate the valve. a

I do not in this applicationclaim thatwhich is the subject-matter of my application Serial No. 188,014, and such matter of that application as is shown herein I hereby reserve to be claimed in that application.

Having thus described my invention, what I claim, and desire to secure by Letters Patent of the United States, is-

1. The combination, wi h a steam-chest or valve-easing having a steam-entrance port or ports, a, independent of the exhaust-port communicating with each end of the cylinder, and exhaust-ports as described, of a valve stem and valve carried thereby, said valve being provided with transverse end partitions and with a port or ports, d, at each end,-adapted to register alternately with or to be cut oil from the ports a by the rotation of the valve, and thereby place the cylinder incommunication with the liv-steam duct, substantially,

as set forth. p 1 2. The combination, with a steam-chest o valve-casing having a steam-entrance port or ports, a, independent of the exhaust-port communicating with each end of the cylinder, and exhaustports, as described, of a valve-stem and hollow cylindrical valve carried thereby,

said valve being provided with transverse end partitions, with an opening for receiving live steam into its interior, and with a port or ports, at, at each end, adapted to register a;

ternately with or to be cut. 011' from the firstment-ioned ports by the rotation of the valve, substantially as set forth. v

3. The combination, with a rotating and reciprocating valve, of a rock-lever connected therewith to reciprocate the same, a bell-crank lever pivoted upon the rock-lever, means for oscillating said bell-leverrelative to the rock lever, and connections between the bell-crank leverand the valve for oscillating the lat-- ter, substantially as described. I

4. The combination, with a rotating and reciprocating valve, of a moving part for reciprocating the valve,-abell-crank lever mounted upon a pivot carried by said part, means for I oscillating thebell-crank lever relative to said i I moving parts, and connections between the bell=crank lever and the valve for oscillating the latter, substantially as set forth.

5. The combination of the valve and valve- 1 stem, a rock-lever for reciprocating the same,

the bell-lever G, arm D, and rod J, nnivers ally jointed, as described, for oscillating the valve, and the link F, pivoted to said rock-lever and having the universal joint f, with the valve-stein, substantially as set forth. 7

6. The combination, with a rotating and reciprocating valve, of a rock-lever connected therewith to oscillate the same, a. bell-crank lever pivoted thereon, a speed-governor 0on nected with said bell-lever for regulating its motion relative to the rock-lever, and connections between the bell-crank lever and the 'valve for oscillating the latter, substantially as set forth.

7. The combination, with a steam-chest or valvecasing having exhaustports. of the valve-stein D, and the hollow operating portions D D for opening and closing the exhaust-ports by reciprocation, said portions being provided with ports which act by the oscillation of the valve, and the steam-chest be Witnesses:

O. L. HARDING, THOMAS BRADE'N. 

